<template>
    <div class="list" ref="wrapper">
        <div >
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <button class="button">{{this.currentCity}}</button>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <button 
                        class="button"
                        v-for='item of hot'
                        :key='item.id'
                        @click='handleCityClick(item.name)'
                    >{{item.name}}</button>
                </div>
            </div>
            <div 
                class="area" 
                v-for='(item,key) of cities' 
                :key='key'
                :ref='key'
            >
                <div class="title border-topbottom">{{key}}</div>
                <ul class="item-list">
                    <li 
                        class="item border-bottom"
                        v-for='innerItem of item'
                        :key='innerItem.id'
                        @click='handleCityClick(innerItem.name)'
                    >{{innerItem.name}}</li>
                </ul>
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'

export default {
    name: 'CityList',
    props:{
        hot: Array,
        cities: Object,
        letter: String
    },
    computed:{
        ...mapState({
            currentCity: 'city'
        })
    },
    methods: {
        handleCityClick(city){
            //数据简单的时候可以省略dispatch此步,直接使用commit
            // this.$store.commit('changeCity', city)
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    watch: {
        letter(){
            if(this.letter){
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
    mounted (){
        this.scroll = new Bscroll(this.$refs.wrapper)
    }
}
</script>

<style lang="stylus" scoped>
    @import '~style/varibles.styl'

    .border-topbottom
        &:before
            border-color: #ccc
        &:after
            border-color: #ccc
    .border-bottom
        &before
            border-color: red
    .list
        overflow: hidden
        position: absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom: 0
        .title
            line-height:.54rem
            background: #eee
            color: #666
            padding-left: .2rem
            font-size: .26rem
        .button-list
            padding: .1rem .6rem .1rem .1rem
            .button
                margin: .1rem
                width: 29%
                text-align: center
                border: .02rem solid #ccc
                border-radius: .06rem
                background: #fff
        .item-list
            .item
                line-height: .76rem
                padding-left: .2rem
    
</style>